Diversity of Wisconsin Rosids.... violets, willows, spurges...
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1 Diversity of Wisconsin Rosids... violets, willows, spurges...
2 Violaceae - violet family A tropical to temperate family of 800 species in about 20 genera. They comprise herbs (ours) to vines and trees. Over 200 are violets (Viola). Wisconsin has around 28 species of Viola and 1 member of Hybanthus. Viola tricolor - pansy, jonny-jump-up Viola affinis - sand violet
3 Hybanthus concolor - green violet Special concern, almost extripated Violaceae - violet family
4 Violaceae - violet family Violets herbaceous basal or stemmed leaved Leaves often heart shaped and palmately veined or lobed, and sometimes palmately compound. Stipules are well developed.
5 Violaceae - violet family CA 5 COZ 5 A 5 G (3) Flowers insect pollinated, with nectar guides, and strongly zygomorphic Perianth 5 merous Lower petal spurred, 2 lower stamens have spurs going back into the petal spur 5 stamens form extensions of connective around style Pistil 3 carpellate with parietal placentation
6 Violaceae - violet family Pistil forms 3 parting capsule in chasmogamous flowers (open flowers) from out-crossing Cleistogamous, or closed flowers, form small capsules via selfpollination (note the parietal placentation in upper capsule)
7 Violaceae - violet family V. pedata Bird s-foot violet early spring, open area violets V. pedatifida Prairie violet
8 Violaceae - violet family V. pubescens - downy yellow violet A stemmed yellow violet early spring, woodland violets V. canadensis - Canada white violet A stemmed white violet
9 V. sororia wood violet Wisconsin state flower! One of many stemless purple violets these often hybridize making them particularly difficult to key out Violaceae - violet family V. macloskeyi Wild white violet A small white flowered violet
10 Hypericaceae - St. John s-wort family A small family of temperate herbs or small shrubs of 9 genera and 560 species ( = Clusiaceae or Guttiferae). In Wisconsin we have 2 genera (Hypericum and Triadenum) and 14 species. Some are invasive. All of our species are opposite leaved Many of the species have leaves that are punctate - with quite visible clear to black dots, these sometimes seen on petals as well Hypericum punctatum - St. John s-wort
11 Hypericaceae - St. John s-wort family CA 5 CO 5 A G (3-5) Flowers yellow (Hypericum) or pink (Triadenum) Stamens many, often grouped at base Hypericum perforatum - Klamath weed [ecologically invasive] Note the perforations along edge of yellow petals
12 Hypericaceae - St. John s-wort family CA 5 CO 5 A G (3-5) Pistil made up of 3 to 5 fused carpels with axile or parietal placentation Fruit a capsule Hypericum ascyron great St. John s wort
13 Hypericaceae - St. John s-wort family Triadenum virginicum marsh St. John s wort Wetland species with pinkish petals and fewer stamens
14 Salicaceae - willow family A woody family of about 55 genera and over 1000 species most willows. In Wisconsin we have 2 genera (Populus, Salix) and 6 species. All have simple, alternate leaves. Populus deltoides - American cottonwood
15 Salicaceae - willow family A woody family of about 55 genera and over 1000 species most willows. In Wisconsin we have 2 genera (Populus, Salix) and 6 species. All have simple, alternate leaves. Salix babylonica - weeping willow Salix fragilis - crack willow
16 Salicaceae - willow family male Populus - poplars, cottonwood, aspens female Trees dioecious = male and female trees, sometimes clonal Male and female flowers reduced and in catkins or aments - wind pollinated! Male flowers are reduced to essentially stamens Populus deltoides American cottonwood Female flowers reduced to only a 2-3 carpellate pistil, with large feathery styles
17 Salicaceae - willow family The flowers possess a disk, which is probably reduced sepals Each flower is subtended by a bract = modified leaf Fruit is a capsule which release the seeds with a coma attached (cottony hairs; how cottonwood gets its name) Wind dispersed seeds as well!
18 Salicaceae - willow family P. tremuloides trrembling aspen P. grandidentata bigtooth aspen These aspens are clonal from root sprouts, fast growing, light wooded, and important for pulp in the paper industry Bark is light grey; leaves have flattened petioles
19 Salicaceae - willow family Populus balsamifera Balsam poplar, balm-of-gilead Populus alba White poplar Introduced from Europe
20 Salicaceae - willow family female male Salix - willows Dioecious as in Populus But, both wind and insect pollinated!
21 Salicaceae - willow family female male Unlike Populus, the willow flowers have no disk, but instead a gland for nectar production and insect pollination in addition to wind pollination Like Populus, the willow flowers have bracts; and the fruit is a capsule with cottony seeds
22 Salicaceae - willow family Salix - willows Many species are precocious - flower before leaves flush in spring Salix discolor - pussy willow
23 Salicaceae - willow family Salix pedicellaris - bog willow Salix humilis - prairie willow Note capsule and cottony seeds
24 Euphorbiaceae - spurge family A large cosmopolitan family of trees, shrubs, and herbs Latex bearing and filled with nasty chemicals (source of rubber, castor oil, tapioca, poinsettia). Leaves alternate, simple (often palmately lobed) or palmately compound. CA 5 CO 0 A G 0 CA 5 CO 0 A 0 G (3) Family has unisexual flowers, 5 sepals, no petals, numerous stamens, 3 fused carpels, and capsules Ricinus - castor oil bean
25 Euphorbiaceae - spurge family Acalypha rhomboidea copper leaf, mercury (native) A Wisconsin example of this typical type of male and female unisexual flower arrangement
26 Euphorbiaceae - spurge family Croton glandulosus sand croton (naturalized) A Wisconsin example of this typical type of male and female unisexual flower arrangement
27 Euphorbiaceae - spurge family A quite different arrangement of unisexual flowers is seen in many of our spurges of the genera Euphorbia and Chamaesyce. Flower or inflorescence?
28 Euphorbiaceae - spurge family The flower of our flowering spurge is actually a highly modified inflorescence = cyathium Euphorbia corollata - flowering spurge (native) Shown here are 3 cyathia; the whole unit here is one cyathium
29 Euphorbiaceae - spurge family Cyathium is composed of: glands appendages of glands many 1-stamened male flowers (no perianth) one 3-carpellate female flower (no perianth)
30 Euphorbiaceae - spurge family Euphorbia virgata (E. esula) - leafy spurge One of several species labelled obnoxious weed by state law Clonal growth, out-competes range plants as it spreads westward, and avoided by cattle and other animals
31 Euphorbiaceae - spurge family Euphorbia polygonifolia (Chamaesyce p.) - seaside spurge One of several species that are restricted to the Great Lakes coasts with wider disjunct distributions along the Atlantic marine coasts (also includes beach pea, sea rocket)
32 Celastraceae bittersweet family An important tropical family of vines. We have vines, shrubs, and herbs. Celastrus scandens American bittersweet
33 Celastraceae bittersweet family An important tropical family of vines. We have vines, shrubs, and herbs. Celastrus orbiculatus Oriental bittersweet invasive
34 Celastraceae bittersweet family An important tropical family of vines. We have vines, shrubs, and herbs. Euonymus atropurpurea Eastern wahoo, burning-bush
35 Celastraceae bittersweet family Parnassia - grass of parnassus - has now been moved from unrelated to Saxifragaceae. Note the staminodia. Calciphiles (adapted to high calcium areas like fens, limestone pavement- e.g. Door Co.) P. glauca P. palustris [threatened] P. parviflora [endangered]
36 Cucurbitaceae - melon family A tropical, subtropical, and temperate family of vines. Most noted for important fruits such as gourds, melons, cucumbers. Alternate, simple leaves which are typically palmately lobed and veined. Tendrils are modified inflorescences. Echinocystis lobata - wild cucumber
37 Cucurbitaceae - melon family Flowers unisexual and plants monoecious Sepals and petals are both fused; stamens are weird, female flower is epigynous Male flower left Female flower right
38 Cucurbitaceae - melon family Flowers unisexual and plants monoecious Sepals and petals are both fused; stamens are weird, female flower is epigynous Fruit is a berry with leathery rind = pepo (pumpkin)
39 Cucurbitaceae - melon family Echinocystis lobata wild cucumber Note the many small male flowers and few female flowers going into fruit and spiny pepo Early spring seedlings are common with 2 large cotyledons
40 Cucurbitaceae - melon family Sicyos angulata - bur cucumber Small burred cucumber or pickle-like fruits can be seen on bottom right
41 Vitaceae - grape family Vines in the tropics and temperate areas. In Wisconsin we have 2 genera and 6 species. Includes one of the most celebrated of all plants Vitis vinifera -wine grape. Flowers are small and usually clustered in more showy inflorescences. Fruits berries with several seeds. Parthenocissus tricuspidata - Boston ivy Vitis - grape
42 Vitaceae - grape family Leaves simple in Vitis (grapes) and usually compound in Parthenocissus (woodbines, Boston ivy); venation and lobing usually strongly palmate Vitis - grape Plants climb by tendrils = modified branches or inflorescences; others climb by holdfasts; these often negatively phototropic Parthenocissus - Boston ivy
43 Vitaceae - grape family Parthenocissus quinquefolia - Virginia creeper, woodbine
44 Vitaceae - grape family Parthenocissus quinquefolia Virginia creeper, woodbine Parthenocissus inserta grape woodbine
45 Vitaceae - grape family Vitis riparia (+ V. vulpina) River, frost grape Vitis aestivalis Summer grape
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